package cn.medemede.servlet;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

public class LoginFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        String site=filterConfig.getInitParameter("Site");
        System.out.println("网址名称："+site);
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        HttpSession session = request.getSession(false);

        if (session == null || session.getAttribute("user") == null) {
            response.sendRedirect("/javaweb/index.jsp");
        } else {
            filterChain.doFilter(request, response);
        }
    }

    @Override
    public void destroy() {
    }

}
